Thursday, September 10, 2015

Season 8 group 1b statistics

Group 1b had a 11 games that ended prematurely in an engine crash (not including the first Alfil game that was later replaced by Crafty). I did not include these games in the statistics in order to avoid biases in some of the results - draw rate is an obvious example.

For each category I briefly compare to the group 1a results. The differences represent the preferences of the engines in the two groups.

Draw rate, wins

This is quite similar to the group 1a graph, within 3% in each category.

Moves per game

median = 60.0
average = 63.67

Again similar to group 1a, medians and averages within 4 moves.

Time per game (hours)

median = 3:31
average = 3:35

Medians and averages within 4 minutes of group 1a stats.

First move

Group 1b had a significant bias for 1. e4 games, 64%. In group 1a it was 56%.Openings
Using ECO codes there were 32 different openings. The top 3 ECO codes were:
C01 6 times - French Exchange
C12 4 times - French: MacCutcheon
C68 4 times - Spanish: Exchange

Using full opening name there were 45 different openings, a little more repetative that in group 1a. There were three openings that were repeated 3 times:
- French: Exchange, 4.Nc3 Nf6 5.Nf3
- French: MacCutcheon, Chigorin Variation
- Spanish: Exchange, 5.O-O Bg4 6.h3

Using only the first letter of the ECO codes we get the following distribution:

Compared to group 1a there were less Queen Gambit games, and more Sicillians and Indians.

If we use the opening 'family name' (using format FAMILY_NAME: VARIANT....) the top 3 are:
French - 16 times
Spanish - 8 times
Nimzo-Indian - 6 times

The French was very popular in group 1a as well, but the Spanish and Nimzo-Indian openings were very rare there.